Added note about the UNIX optionswindow modality problem.

git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@77 3789f03b-4d11-0410-bbf8-ca57d06f2519

doc/TODO

@@ -1,4 +1,8 @@
 
+* The dialog boxes in the UNIX viewer isn't as modal as they should
+  be. For example, sometimes, when opening the OptionsDialog from the
+  login window, the OptionsDialog appears *behind* the login window. 
+
 * Change version strings. 
 
 * Perhaps change icons.